Glossary · Phase 0 · Tools
Comprehension
A one-line way to build a list from another, like [x * 2 for x in prices].
Try it now
The loop builds active one item at a time, checking each one. Line 7 does the same filtering in a single step.
Learn it properly
Comprehensions · Filter and transform a whole collection in one readable line. About 25 minutes.
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